public static Stream ConvertAiffToMp3(Stream aiffStream, string directory)
{
_uniqueTempFileCounter += 1;
var tempFile = Path.GetTempFileName();
using (var rdr = new AiffFileReader(aiffStream))
{
//can't go from 24 bits aif to mp3 directly, create temporary 16 bit wav
if (rdr.WaveFormat.BitsPerSample == 24)
{
ISampleProvider sampleprovider = new Pcm24BitToSampleProvider(rdr); //24 bit to sample
var resampler = new WdlResamplingSampleProvider(sampleprovider, SampleRate); //sample to new sample rate
WaveFileWriter.CreateWaveFile16(tempFile, resampler); //sample to actual wave file
return(ConvertWavFileToMp3MemoryStream(tempFile, true)); //file to mp3 bytes
}
else
{
var retMs = FilesystemUtils.recyclableMemoryStreamManager.GetStream();
using (var wtr = new LameMP3FileWriter(retMs, rdr.WaveFormat, BitRate))
{
rdr.CopyTo(wtr);
return(retMs);
}
}
}
}
public static bool ConvertAiffToMp3(byte[] aiffFile, string directory, out byte[] mp3Bytes)
{
mp3Bytes = null;
try
{
_uniqueTempFileCounter += 1;
var tempFile = Path.Combine(directory, "tempdata" + _uniqueTempFileCounter + ".wav");
using (var ms = new MemoryStream(aiffFile))
using (var rdr = new AiffFileReader(ms))
{
if (rdr.WaveFormat.BitsPerSample == 24)
//can't go from 24 bits aif to mp3 directly, create temporary 16 bit wav
{
ISampleProvider sampleprovider = new Pcm24BitToSampleProvider(rdr); //24 bit to sample
var resampler = new WdlResamplingSampleProvider(sampleprovider, SampleRate);
//sample to new sample rate
WaveFileWriter.CreateWaveFile16(tempFile, resampler); //sample to actual wave file
mp3Bytes = ConvertWavToMp3(tempFile, true); //file to mp3 bytes
}
else
{
using (var retMs = new MemoryStream())
using (var wtr = new LameMP3FileWriter(retMs, rdr.WaveFormat, BitRate))
{
rdr.CopyTo(wtr);
mp3Bytes = retMs.ToArray();
}
}
}
return(true);
}
catch (Exception)
{
// ignored
}
return(false);
}